[PATCH RFC 77/77] vxge: Update MSI/MSI-X interrupts enablement code

Alexander Gordeev
2013-10-02T10:49:33Z

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
---
drivers/net/ethernet/neterion/vxge/vxge-main.c | 36 ++++++++++-------------
1 files changed, 16 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/neterion/vxge/vxge-main.c b/drivers/net/ethernet/neterion/vxge/vxge-main.c
index b81ff8b..b4d40dd 100644
--- a/drivers/net/ethernet/neterion/vxge/vxge-main.c
+++ b/drivers/net/ethernet/neterion/vxge/vxge-main.c
@@ -2297,7 +2297,21 @@ static int vxge_alloc_msix(struct vxgedev *vdev)
int msix_intr_vect = 0, temp;
vdev->intr_cnt = 0;

-start:
+ ret = pci_msix_table_size(vdev->pdev);
+ if (ret < 0)
+ goto alloc_entries_failed;
+
+ if (ret < (vdev->no_of_vpath * 2 + 1)) {
+ if ((max_config_vpath != VXGE_USE_DEFAULT) || (ret < 3)) {
+ ret = -ENOSPC;
+ goto alloc_entries_failed;
+ }
+ /* Try with less no of vector by reducing no of vpaths count */
+ temp = (ret - 1)/2;
+ vxge_close_vpaths(vdev, temp);
+ vdev->no_of_vpath = temp;
+ }
+
/* Tx/Rx MSIX Vectors count */
vdev->intr_cnt = vdev->no_of_vpath * 2;

@@ -2347,25 +2361,7 @@ start:
vdev->vxge_entries[j].in_use = 0;

ret = pci_enable_msix(vdev->pdev, vdev->entries, vdev->intr_cnt);
- if (ret > 0) {
- vxge_debug_init(VXGE_ERR,
- "%s: MSI-X enable failed for %d vectors, ret: %d",
- VXGE_DRIVER_NAME, vdev->intr_cnt, ret);
- if ((max_config_vpath != VXGE_USE_DEFAULT) || (ret < 3)) {
- ret = -ENOSPC;
- goto enable_msix_failed;
- }
-
- kfree(vdev->entries);
- kfree(vdev->vxge_entries);
- vdev->entries = NULL;
- vdev->vxge_entries = NULL;
- /* Try with less no of vector by reducing no of vpaths count */
- temp = (ret - 1)/2;
- vxge_close_vpaths(vdev, temp);
- vdev->no_of_vpath = temp;
- goto start;
- } else if (ret < 0)
+ if (ret)
goto enable_msix_failed;
return 0;

--
1.7.7.6